True Unit Power Factor Active Front End for High-Capacity Belt-Conveyor Systems

Belt conveyors in mining industry constitute an efficient and economical way for minerals and heavy-load transportation from mines to their destination. The ongoing desire to further extend the length, speed, and capacity of the conveyors has led to the increasing size of the conveyor-drive systems. More and more frequently, high-capacity belt conveyors are efficiently driven employing medium-voltage power converters connected with large induction motors. Power converters in the megawatt (MW) range are often used, increasing the power-quality issues in the grid system. This work proposes a new true unit power factor active front end for regenerative multimotor conveyor-drive systems. The proposed solution eliminates all the current harmonics in the range considered by the international standards without using sinusoidal filters. Three-winding conventional transformer and well-established medium-voltage power converters are considered to ensure the robustness and simplicity requirements.

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